Warp stop motion



Aug. 29, 1933. w. c. HOWE ET AL WARP STOP MOT I ON Fi led Feb. 6, 1931 5 5 m5: r W 5 J war N h w @m 1 WM 5. A W UV W A W Fm L5 Wu Patented Aug. 29, 1933 Massachusetts Application February 1931. s mi o. 513,962

1:; Claims. (01 139-351).

This invention relates to improvements in warp stop motions having bars which extend through slots in drop wires and it is the general object of the inventionto facilitate the finding of a broken warpithread in such. a motion. 7

In certain forms of warp stop motions the drop Wires have longitudinal slots in their upper portions through which extend contact bars. In electrical motions there-isordinarily norelative movement of the parts of the bars nor are the bars themselves moved as a;unit to indicate the location of the .fallen drop. ,It is an important object of our invention to provide these bars with roughened or knurled parts which will contact with a drop wire in lowered position so as to Y arrest movement thereof longitudinally of the bar when such movement is inducedby the. weaver.

In one form'of our inventionwe employ a contact bar having a longitudinal rib to coactwith an inwardly projecting cam on the drop wire, and provide this rib with corrugations so'that when the drop wire is in down position the projection Will contact, with the corrugated part of the rib and resist endwise movement, thereby indicating its location. In another form of ourinvention thecorrugations are placed on the t0p 0f the bar where they will engage the upper end of the slot in the. fallen drop wire and resist movement of the latter. Because of thefact'that the drop wire must close a circuit when it falls there is necessarily a gap between the upper-knurled edge of the barand the t'opof the slot, but this space is very small and a slight tilting. of the drop wire about the rib as, a pivot will bring the top of the slot into engagement with. the knurled edge to prevent sidewise movement. V. v

Another feature of the invention relates to the rib on .thebar and the corresponding projections on the drop Wire. When a wire is held in normal raised position by its thread the'latter becomes the pivot around which the wireswings when moved by the weavers hand; The resulting large arc of movement tends to keepthe raised wire "from contacting with the. top of'the bar. When the wire falls, however, itsprojections' and rib on the bar become the pivot and the radius'of turning is-greatly reduced, tendingto cause en- "gagement between the top of the bar and wire with relatively small movement on the part of the latter. This facilitates finding ofthe fallen dropwire. Y. w

"Withthese andother objects in view which will appear as the description proceeds, our -in-' ventionresides the combination arrange-- a modified form of bar,"

ment or parts hereinafter describedand set forth in the claims. v p l In the accompanying drawing, wherein a constop motion having the preferred forrn of our invention and showing the manner of separating venient embodiment of our invention is-setforth,

the drop wires, the support being shown in Section,

Fig. 2 is a perspective view showing the preferred form of contact bar;

Fig. 3 is a view similarjto Fig. 2 but-showing Fig. 4 is a cross section on line 4--4and show.- ing adrop wire in fallen position,-and Fig. 5 is a detailed view showing a portion of a contact bar and the manner in ing a series of lower separator bars 12 which act to space the lower ends of the metallic drop wires ,Dofdifferent banks. Thezupperpartsqofj the holders space the detector bars 13.

The bars are formed of an outeninclosin g support lever, andalso an inner insulated elec trode 15 which isjheld out of contactwith the outer member. by'means of insulation designated at 16, in Fig. 4. The sheath is provided with a which the rib v serves asa pivot for theg fallen drop wire.

Referring to Fig. 1, we have shown a supporting =-bar 10 on whichis mounted a holderll supportso sheath member 14 grounded by contact withthe.

rib'l'l; adapted to coact with onefofa pair of intions 18. above the rib 17. When a warp thread breaks or becomes unduly slack the drop ,wire corresponding. thereto will fall so that one of the projections 18 will engage the ribfand act tomove the drop wire laterally so that the oppositepro jection will have contact with the plate 15. When" this latter conditionexists'the two. bars will 'be connected through the metallic drop wire anda circuit not set forthlflherein will effect loom stoppage. V

In carrying our present invention hinto effect .we aim to provide means wherebythe location of the fallen drop wire may be readily ascertained,.and inthepreferred formof our invention we provide the upper turned over part of -thecontact bari1 c with a:knurled"or;roughened surface 30. The

effect of the knurling is to provide a seriesof transverse grooves which willact; to. receive the t p Qfl s o o a len iw a revent sult in moving position shown a in full linesto that shown in 7 describe relatively large arcs;

J knurling of the top of the further movement thereof along the bar. When the loom has been stopped because of a warp fault the weaver will run his hand over the drop wires asindicatedin Eigxl, pressing the drop wires down so that they assume an inclinedposition. As indicated inFig. 5 this action will rea vertical drop'jwire from the dotted lines. o

All of the. wires corresponding to the unbroken swing around their warp warp threads will 7 threads as pivots and these ends will therefore The drop wire which corresponds to the broken fallen drop wire moves. Because of the factthat the rib and electrode 15 are above the sheet of warp threads the radius around which the fallen drop wire moves is considerably reducedand it therefore more quickly comes into 2 contact with the knurled surface SD. It is found in-practice that the tendency of the fallen drop wire along the bar isarrested becausc of the fact that the top'of the slot 19 is in engagement with one ofthe transverse grooves resulting from the bar. It is to be understood from an inspection of Fig. 4 that the top of said slot is in close proximity to the knurled sur face'when the drop-wire is down.

In the modified form of the invention we place the knurled surface 40 on the ribwhere it will become engaged with one of the projections 18 and thereby resist movement along the bar. Withjthis form of the'inventionthe weaver will I follow the same procedure as-with the preferred :form and the upper part of the fallen drop wire will turnaround the rib-as a center so that the- -top-of the slot will engage the rounded upper surface of the outer contact member 14' to resist "further'movement on the part of the weavers hand. a r From' the foregoing it will be seenthat wehave -provided' a' very simple means for assisting a 'weaver to determine the location of a fallen-drop -wire, this means including'a ribformed-orr the contact her so as-to require the upper end of the drop wire to swing around arelatively short radius and-"thereby quickly bring the top ofthe slot into'engagement with-a resisting surface of the contact bar. 'In each form this action takes place but in the preferred form the roughened surface is placed at the top' of the bar while in "the rnodifiedf'orm the roughened surface is placed on: therib. The procedure of finding the fallen drop isfacilitated by the fact that the 'major part of the drop wires will swing around a'relatively long radius whereas the fallen dropwire is caused to swing around the-shortradius; I Having thusdescribed ourinvention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of themvention and we do not wish to be limited to the 1 details herein disclosedjabut what we claimis Ina warp 'stop -motionj a bar extending itransversely ofthe warp thread'sja bank of drop wires," each wire' having a slotf therein through vvhi'ch the bgifbxtends; and said bar' having a roughenedsurface at-its' upperedge ineffective to restrain' movement of araised drop wire along thegbar but positioned to-en'gagea fallen drop -w-ire and resist movement thereof along the bar.

thread, however; is in fallenposition as indicated in full lines in; I Fig. 4 and the projections 18 thereof will engage the rib and contact electrode 15, and thesepoints becoming the pivot around'which'the top of the spaced considerably movement of the drop wire along the bar when ,wire'having a. projection extending'into the slot Jection on the drOp' ,wire; extending into .the slot 2. In a warp stop motion, a bar extending transversely of the warp threads, a bank of drop wires, each wire having a slot therein and a projection extending into the slot, a rib on the bar normally below and out of contact with the projections, and a; roughenedsurface .on the bar out offconta'ctwith the drop wire: whenxthe'f bar is centrally disposed relatively to the slot of a drop wire in normal position, a fallen drop wire engaging the roughened surface and being resisted thereby in movement along the bar. 7

*BIInawarp" stop motion, a bar extending transversely of rthelwarp threads and having an upper surfaceand a longitudinal projecting sur pface.therbelovwabank of drop wires, each wire havingiazslotztheitopof which is normally spaced from-the upper surface and each drop wire hav- 'ing a project'ion'exten'cling into the slot below the atop of the latter, one of said surfaces being roughened, the projection of a fallen drop wire engaging the projecting surface to 'cause the top crthe slotto move into engagement with the upper b'ar surface when 'the'fallen wire is inclined toward the bar, the'roughenejd surface resisting the wire isinclinedand in-engagement with both surfaces. I

4. In a warp stop motion; a .bar' extending transverselyof thewar-p threads and having: an

upper surface and a longitudinal: projecting surface therebel'ow,-a:.bank of: drop wires; eachwire having: a slot J the top of-which is normally spaced! from the" upper surface: andweach drop below the top of ,thelatter, the upper surface be ing'rou'ghened, the projection of a fallen drop wire engaging the projecting surface tozcause the top-of. the slot to move'intoengagenient: with the upper bar. surfacevwhen the fallen wire is in- ;clined toward the banthe roughenedasurface'resisting movementofthe'dropzwirealong the bar when the wireis inclinedand' in engagement with both surfaces..

.5.. In a 'warp stop: motion a bar extending m0 transversely :Ofi-ilhi iwarpi' threadsand: :having an upper surface andea longitudinal .proj ecting= surface}therebelow; a banker" dropiw-ires. each; wire havingaisloti the; top of whichis normally spaced .fromthe upper: surface; and. each: drop-wire haviingaeprojectio'n extending into.the.slot below the top of the;.la-tter, the-projectingsurface:;being' roughened, the projection. of a: fallen drop wire engaging the projecting. surface: to cause the top 101". the; slot. to Hmoveinto; engagement-swith' the upper bar; SUIfELCBT-KWYIBII- the. fallenzwire' is. inlclined toward the bar;.-the: roughened surfacezresisting .movement'ofithe :drop wire along the: bar when the wire is. inclinedandinengagementwith both surfaces. r

transversely of the warp? threads -aibankv-of; drop wires each having aslot. therein throughmwhich the bar 1 extends, a rib extending ,along. the .bar below the uppersurfaceof the lattenlandfasproits 6. .In a warp stop motion; a .bar extending 1.85

' 7. In a" warp" stop motion, a bar extending $60 drop wires each having a slot therein through transversely of the warp threads, a bank of which the bar extends, a rib extending along' the bar below the upper surface of the latter, and a projection on the drop wire extending into the slot and adapted for engagement with the rib when the drop wire is fallen, the rib and projection of a fallen drop wire becoming the pivot around which the upper partjof the drop wire swings when deflected laterally to cause the upper part of the slot in the fallen drop wire I to engage the upper surface of the bar and resist further movement along the bar, the upper surface of the bar being roughened to resist movement of the drop wire along the bar.

8. In a warp stop motion, a bar extending transversely of the warp threads, a bank of drop wires each having a slot therein through which the bar extends, a rib extending along the bar below the upper surface of the latter, and a projection on the drop wire extending into the slot and adapted for engagement with the rib when the drop wire is'fallen, the rib and projection of a fallen drop wire becoming the pivot around which the upper part of the drop wire swings when deflected laterally to cause the upper part 'of the slot in the fallen drop wire to engage theupper surface of the bar and resist further movement along the bar, the bar having a roughened surface to engage a deflected fallen drop wire.

9. In a warp stop motion, a bar extending transversely of the warp threads, a bank of drop wires each having a slot therein through which the bar extends, a rib extendingalong the bar below the upper surface of the latter, and a projection on the drop wire extending into the slot and adapted for engagement with the rib when the drop wire is fallen, the rib and projection of a fallen drop wire becoming the pivot around which the upper part of the drop wire swings when deflected laterally to cause the upper part of the slot in the fallen drop wire to engage the upper surface of the bar and resist further movement along the bar, the bar having a roughened surface to engage a deflected fallen drop wire, the

roughened portion of the bar including transverse I grooves.

10. In a warpstop motion, a barjextending transversely of the warp threads, a bank of drop wireseach having a slot therein through which the bar extends, a rib extending'along the bar below the upper surface of the latter, and aprojection on the dropwire extending into the slot and adapted for engagement with the rib when the drop wire is fallen, the drop wires corresponding to the unbroken threads turning about the warp threads as a center when the tops of all the drop wires are deflected in a direction ,along the length of the-bar, and the upper part of thefallen drop wire turning around the rib as a pivot as said fallen drop wire is acted upon to move along the bar, the .upper portion of the slot of the fallen drop wire thereby being brought into contact with the bar sooner than the corresponding portion of the slots of the drop wires on the unbroken threads. I

11. A contact bar for a warp stop motion, said i one side positioned to engage and deflect a fallen drop wire, having a slot and a side lug projecting into said slot and spacedfrom the upper end thereof, the bar having a roughened surface to engage a fallen'dropv wire and resist movement thereof along the bar.

13. In a warp stop motion, a fixed barextending transversely across the warp threads, a set of drop Wires having slots through which'the bar extends, and means defining a series of closely adjacent notches extending along the bar and positioned for engagement with the upper transverse end'portion of the slot of a fallen drop wire to resist movement of the drop wire along the bar.

WILFRED C. HOWE.

OSCAR V. PAYNE. 

